Use or 7-Zip . Extract to C:\Tantra_Kp\ . Do not install to Program Files (x86) as permission errors will occur.
Click the first result. RageZone is the central hub for Tantra development. Look for a thread titled "[Release] Tantra KP Server Files Beta 1.5b.1" . Tantra Kp Beta 1.5b.1 Free Download